The Collaborative International Dictionary of English v.0.48:

Polt \Polt\, n. [Cf. E. pelt, L. pultare to beat, strike.]
   A blow or thump. --Halliwell. -- a. Distorted.
   [1913 Webster]

   Pot foot, a distorted foot. --Sir T. Herbert.
      [1913 Webster] Polt-foot